[Amps] Measuring IMD in a home workshop

[Jim Brown]

On 5/25/2019 8:23 AM, Peter Bertini wrote:
> Unfortunately, the K3 transmitter IMD specs are not good enough for
> amplifier testing.

While that's true, IMD from a K3 is VERY sensitive to output power and 
DC supply voltage. At 100W, it ain't grand, but it's a lot better in the 
range of 25-50W typically used to drive an amp. IMD also decreases with 
higher DC supply voltage. As I understand it, the radio is designed to 
run from a 13.8V supply, and 15V is the max rated supply voltage.

There's measured data on this on my website, done by K6XX. 
http://k9yc.com/K6XXAmpTalk.pdf

73, Jim K9YC